Improvement in sewing-machines



2 Sheets-Sheet 1.

F. M. JOHNSON.

SEWING-MACHINE.

Patented Dec.

N.1a5oss.

w m m n I I W wimszas Y THE GRAPHIC CLN-(- sheets-s118812. F. M. JOHNSON.

SEWING-MACHINE.

FRANK M. JOHNSON, OF BRISTOL, CONNECTICUT, .AssIcNoRoF ONEHALE.

OF HIS RIGHTS TfLEsTER GOGDENOUGH, QE SAME BLAUE..

I'M'PROVEMENT IN SEWING-MACHINES.

Specitication forming part of Letters Patent No. 185,033, dated December 5, 1876; application tiled March 15, 1876.

To all whom lit may concern:

Beit known' that I, FRANK M. JOHNSON, of Bristol, in the county of Hartford and State of Connecticut, have invented certain new and useful Improvements in Sewing- Machines; and I do hereby declare the following to be a full, clear, and exact description of therinvention, such as will enable others skilled in the art to which it pertains to make and use it, reference being had to the accompanying drawings, which formpartof this specification. My invention relates to certain improve ments in rotary-shuttle sewing-machines; and it consists in certain details of construction, which will more fully appear from the following description and claims.

In the accompanying drawings, wherein like letters designate like parts, Figure l represents a front elevation ofthe machine with the face-plate out away to show the means employed for actuating the needle-bar. Fig. 2 shows the shuttle-carrier detached from the race. Fig. 3 represents the shuttle detached from the carrier. Fig. 4 shows the shuttle in position for operation. Fig. 5 is a side elevation ot' the machine. Fig. 6 represents the slide. Fig. 7 shows a modified form of cam to actuate the needle-bar.

A isthe bed or hase ofthe machine, to which bearings a a are secured or formed as a4 part thereof. The shuttle-carrying shaft B is journaled iu bearings a a', and is provided with a collar, b, to receive the end thrust of the shaft. Io eccentric C of shaft B is secured the eccentric strap c, which connects with the lower end ofthe connecting-rod'D. Within the neck of the machine the oscillating the lowervtrack of the guide, and thereby forces the needlebar through its downward stroke, while the needle-bar is forced upwardly by the anti-friction roller working in contact with the upper track or, edge of the guide F. This arrangement of devices for actuating the needle-bar is simple in construction, and requires but little space for its free operation.

The race G has a section of its periphery cut away at g for the reception of the shuttle. To the lower surface rand inner end of slide H is secured a curved plate, It, whichvis of the requisite shape and size to accurately tit within the opening g in the race, so that the latter has a continuous circular guide for the shuttle when the slide is in position. The shuttlecarrier I has a hub, h', secured to its outer surface, within whichA the end ofthe revolving shaft B is secured. Upon the inner surface of the shuttle-carrier is attached the shuttleframe t i', the portion i being curved to receive the heel of the shuttle, while the point of the shuttle rests between, and is retained by, the prongs The shuttle J is`formed with a recess, K, in the center of which the bobbin-journal lo is secured. Upon the outer end of bobbin L there is formed a hub, l, on which the thread-carrier k freely turns.

As the shuttle revolves, the point of the shuttle passes through the loop of the needlethread, while the shuttle-thread passes from.

the bobbin out and against the side ofthe shuttle, and as the bobbin rotates in the same direction with the travel of the shuttle, the shuttle-thread is not twisted, as it is not restricted in any manner by the shuttle, the thread always drawing direct from the bobbin, and having free movement against the outer edge or side of the shuttle.

Instead of using a straight slotted guide, F, a cam-guide, m, may be substituted' therefor, the latter operating to impart an inter-` mittent movement to the needle-bar, to allow of the passage of the shuttle through the loop while the needle-bar is at rest.

Having fully described my invention, what l claim, and desire to secure by Letters Patent, is- 1. The combination, with the circular shuttle-race G, of the sliding cloth-plate H, provided with a depending flange formed as a segment of :L circle, and adapted to fit al corresponding opening in the shut-tle-race,substantially as and for the purpose set forth.

2. The combination, with the shuttle J, of the bobbin L and thread-carrier k', loosely secured to the hub of the bobbin, substantially as and foll the purpose specified.

In testimony that I claim the foregoing I have hereunto set my hand this 2d day of March,1876.

FRANK M. JOHNSON,

Witnesses:

Fi O.MoOLEABY, A. W. BRIGHT. y 

